TB 9-6625-2330-35
(f) DATA ENTRY 200 kHz.
(9) Set up measuring receiver to measure FM with a + PEAK detector, no high-pass
filter and no low-pass filter.
(10) Set up audio analyzer to measure distortion with a slow detecting noise
rejecting filter.
(11) Audio analyzer will indicate within limits specified in table 27.
Audio analyzer
distortion indication
(%)
2%
(12) Press TI FUNCTION-CARR FREQ, FUNCTION-MOD LEVEL, and DATA
deviation. Measuring receiver will indicate within limits specified in table 28.
Table 28. FM Deviation
Measuring receiver indications
Test instrument
(kHz )
DATA ENTRY
DATA ENTRY
modulation
DATA ENTRY
deviation
carrier frequency
Max
Min
(kHz)
(kHz)
(MHz)
1050
1
100
90
110
256
1
27.5
25
22.5
50
1
165
150
135
256
1
205.7
187
168.3
b. Adjustments. No adjustments can be made.
18. Phase Modulation
a. Performance Check
(1) Connect measuring receiver sensor module to TI RF OUTPUT.
(2) Press TI pushbuttons as listed in (a) through (j) below:
(a)
FUNCTION-CARR FREQ.
(b)
DATA ENTRY- 8 MHz.
(c)
FUNCTION-CARR LEVEL.
(d)
DATA ENTRY- 10 dBm.
(e)
FUNCTION-MOD FREQ.
(f)
DATA ENTRY- 1 kHz.
(g)
FUNCTION-MOD LEVEL.
(h)
DATA ENTRY- 10 RAD.
(i)
MODULATION/AUX-MOD ON ONE (red light lit).
(j)
FUNCTION-RF ON to on (red light lit).
